HometownPortola Valley, CA, United StatesEducation University of Wisconsin Milwaukee, Bachelor of Arts / ScienceStanford University, Master of Business Administration

Former Honeywell exec became chief of networking firm Cisco in 1988. Went public 1990, stepped down 5 years later as stock turned into Internet bellwether; briefly, in 2000, the world's most valuable company. Shares down 75% from peak; owns 61.1 million shares worth $1.3 billion. With wife, Tashia, gave $50 million to U of Wisconsin to fund biosciences research in April. Avid cyclist and hiker chairs the Nature Conservancy, which uses private funds to buy up privately held land to protect it from development. New board age limit has him stepping down as Cisco chairman this November.

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